Tracking a reference picture on an electronic device

Abstract

Methods, systems, and apparatus, including computer-readable media, for decoding a video bitstream. A computer-readable medium includes a bitstream stored in the computer-readable medium, the bitstream comprising a wrap indicator, wherein the wrap indicator is used to determine a picture order count (POC) cycle parameter for one or more long term reference pictures in a decoded picture buffer based on a designated picture; wherein the POC cycle parameter indicates a decoded picture set which includes a first long term reference picture; and wherein a current picture is encoded based the first long term reference picture.

What is claimed is: 
     
       1. A system comprising:
 a non-transitory computer-readable medium storing a bitstream comprising data representative of a current picture,
 wherein the data representative of the current picture comprises a wrap indicator, 
 wherein the wrap indicator indicates a transition between two sets of decoded pictures; 
 wherein the wrap indicator is used to determine a picture order count (POC) cycle parameter for one or more long term reference pictures in a decoded picture buffer; 
 wherein the POC cycle parameter indicates a decoded picture set which includes a first long term reference picture; 
 wherein the first long term reference picture is determined based on a designated picture; and 
 wherein the current picture has been encoded based on the first long term reference picture; and 
 
 one or more decoder processors configured to:
 decode the current picture using the wrap indicator in the bitstream to generate a decoded picture. 
 
 
     
     
       2. An apparatus comprising:
 a non-transitory computer-readable medium storing:
 a bitstream comprising data representative of a current picture,
 wherein the data representative of the current picture comprises a wrap indicator, 
 wherein the wrap indicator indicates a transition between two sets of decoded pictures; 
 wherein the wrap indicator is used to determine a picture order count (POC) cycle parameter for one or more long term reference pictures in a decoded picture buffer; 
 wherein the POC cycle parameter indicates a decoded picture set which includes a first long term reference picture; 
 wherein the first long term reference picture is determined based on a designated picture; and 
 wherein the current picture has been encoded based on the first long term reference picture; and 
 
 instructions that when executed by one or more decoder processors cause the one or more decoder processors to decode the current picture using the wrap indicator in the bitstream to generate a decoded picture.